01-31-2017 03:31 PM - edited 01-31-2017 03:33 PM
First, if you buy from an authorized Xilinx distributor (example: Avnet, your would call them). A quick online search shows you start with their (Avnet) sales support.
If you buy directly from Xilinx, you go to a Xilinx sales support center. They then help you get in touch with the right FAE (some are specialists, some are generalists, so we need to figure out who is best.
There service portal is also a place to start:
Hope that helps.
Of course, asking here may be the fastest way to get an answer.